Recycle Silk Fibers Sliver is available in assorted colorways. They are the strong natural fibers and are spun into a wonderful yarn used for knitting and weaving. The fiber is a smooth filament and the fabric out of it is comfortable against the skin. Silk Fibers are well known for its shine, Lustre and tensile strength. This fiber is recycled in nature. This fiber is created as a byproduct of Sari production in India. The bright colors are a wonderful addition to a spinning or felting project.